How Coal Works | Union of Concerned Scientists
WEBDec 15, 2017 · The volume of waste from processing coal can be substantial; 35 – 40 percent of the raw coal going into a typical washing plants was left behind as waste in 2010. About thirty percent of US freight train traffic comes from coal. Photo: Wsilver/CC BY (Flickr) ... Aging coal plants, the cheap price of natural gas, and the environmental .